ENGLISH·COURSE API
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    Variable

    unmarkLessonCompleteActionConst

    unmarkLessonCompleteAction: SafeActionFn<
        string,
        ZodObject<{ lessonId: $ZodBranded<ZodUUID, "LessonId", "out"> }, $strip>,
        readonly [],
        {} & { lessonId?: {} },
        { unmarked: boolean },
    > = ...

    Clears a lesson's completion for the signed-in learner — their own undo.

    { unmarked: false } when the lesson does not exist